extending PersistentList

Hi,

I have been looking for a way to extend PersistentList in an elegant way. I 
tried overriding the abstract methods in MutableSequence but ofcourds that 
does not work, because UserList overrides all methods in MutableSequence 
(don't know why; speed reasons?).

I also tried this:

class ServerFieldList(PersistentList):

    def __init__(self, items, owner=None):
        super(ServerFieldList, self).__init__(items)
        self.owner = owner

    def _get_changed(self):
        return Persistent._get_changed(self)

    def _set_changed(self, value):
        Persistent._set_changed(self, value)
        self.owner.__dirty__ = True

    def _del_changed(self):
        Persistent._del_changed(self)
        self.owner.__dirty__ = True

    _p_changed = property(_get_changed, _set_changed, _del_changed)



but directly both calling the _get_changed etc methods in Persistent or using super(ServerFieldList, self) gives me an AttributeError, while i can clearly see these methods in Persistent. must have something to do with the @implementer decorator.


Is there anyway to access the _get_changed directly, or any way to get this to work, preferably without extending all methods in PersistentList or UserList?


Cheers, Lars  

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